Osprey Aether 85 Backpack Unique feature: 2/3 length aluminum stay IsoForm Harness: Spacer mesh surface with no sewn seams, hook and loop adjustable yoke allows 4"/10cm of fine torso adjustment Lightweight Alloy Peripheral Frame Suspension: Ribbed foam backpanel with grip mesh and recycled HDPE framesheet with weight reducing cutouts IsoForm CM Hipbelt: Heat moldable foam (using Osprey CM in-store hipbelt ovens) with ErgoPull hipbelt closure Volume: 5400cu in/88L Weight: 5lbs 4oz/2.38kg